type 'a dynArray = {
  mutable size : int;
  mutable maxCapacity : int;
  mutable a : 'a array;
}
val next_power_of_two : int -> int
val make : int -> 'a -> 'a dynArray
val get : 'a dynArray -> int -> 'a
val set : 'a dynArray -> 'a -> int -> unit
val size : 'a dynArray -> int
val add : 'a dynArray -> 'a -> unit
